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ICSE Class 10 Chemistry Question 17 of 93

Organic Chemistry — Question 36

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Question 5

Define or explain chain isomerism and position isomerism with examples in each case.

Answer

Chain isomerism — When two or more compounds have a similar molecular formula but are different in the arrangement of carbon atoms in straight or branched chains the compounds are referred as chain isomers.

Example: Pentane C5H12

Pentane [n-pentane]

Draw the structures of isomers of pentane. Organic Chemistry, Simplified Chemistry Dalal Solutions ICSE Class 10

2-Methyl butane [iso-pentane]

Draw the structures of isomers of pentane. Organic Chemistry, Simplified Chemistry Dalal Solutions ICSE Class 10

2,2 Dimethyl Propane [neo-pentane]

Draw the structures of isomers of pentane. Organic Chemistry, Simplified Chemistry Dalal Solutions ICSE Class 10

Position isomers — When two or more compounds with the same molecular formula differ in the position of substituent atom or functional group on the carbon atom, they are called position isomers.

Example : But-1-yne and But-2-yne

But-1-yne

Give at least one example in each case to show the structure of isomers of Triple bond compound. Organic Chemistry, Concise Chemistry Solutions ICSE Class 10

But-2-yne

Draw the structural formula of But-2-yne. Organic Chemistry, Simplified Chemistry Dalal Solutions ICSE Class 10